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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
ip igmp max-groups
• If you configure the throttling action as replace and set the maximum group limitation, the entries
that were previously in the forwarding table are removed. When the maximum number of entries is
in the forwarding table, the switch replaces a randomly selected multicast entry with the received
IGMP report.
• When the maximum group limitation is set to the default (no maximum), entering the ip igmp
max-groups {deny | replace} command has no effect.
Examples This example shows how to limit to 25 the number of IGMP groups that an interface can join:
Switch(config)# interface fastethernet0/1
Switch(config-if)# ip igmp max-groups 25
This example shows how to configure the switch to replace the existing group with the new group for
which the IGMP report was received when the maximum number of entries is in the forwarding table:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip igmp max-groups action replace
You can verify your setting by using the show running-config interface interface-id privileged EXEC
command.
Related Commands Command Description
show running-config interface
interface-id
Displays the running configuration on the switch interface, including
the maximum number of IGMP groups that an interface can join and
the throttling action. For syntax information, select Cisco IOS
Configuration Fundamentals Command Reference for Release 12.1
> Cisco IOS File Management Commands > Configuration File
Commands.
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